Process for dyeing cellulose esters and ethers



20 dyed by the use of these mt-s a Mar 13, 1928.

" N D wise PATENT OFFICE.

nonzero) sun's nonsjrm, mum oonnou newnm, AND-JAMEQ HILL, or Bummer, xmcnnsma, ENGLAND, usmuons 'ro BRITISH nsrnsmosrs oonroumxou 1.1m

1221), HANCHESI'ER, ENGLAND.

rnocnss FOB mznnm onnnnnosn neurons nun masses Drawing. Application filed March 2,1927, Serial No,

. We have found that new and valuable Shades can he obtained by dyeing cellulose esters and ethers with azo dyestuils pre-- pared b diazotizing amino derivatives of laryl sul honalylamides v and coupling the diazo-ho ies with unsulphonuted uryl amines. By aryl We understand a hdro' carbon radiole 101 the benzene or nap1thalene series, including'suhstitution products. 10 The sulphonarylides are readily prepered by treatlng the; acid chloride ofn nitrosulphonic acid with an aromatic amino oompound and subsequently reducing. the product so obtained, or they may be prepared in an other conyenie'nt way. The dyestuffs are s ightly soluble iii water and their solu bility is considerably increased in sodium carbonate solution. As examples of the why in which cellulose esters or ethers ma be dyestull's, we may quote the following, it being understood, however, that these examples in no wise limit the scope of the invention Ema/mph 1.

lt wample Q.

40 One part ofthe dyestiitf prepared by diazotizlng m amino benzene sulphon-m-nitranilide and coupling it with eresidine (m-amino-p-cresol methyl ether), is used for 1%,185. and in Great Britain June 1-1, 18:26,

preparing a dyeing ecoordiug to the method of Example 1, and gives u very lustrous orangewed shade,

Wurt we ,oluim and desire to secure by Letters Patent is l l. The process of dyeing cellulose esters and others, comprising applying azo dyestuffs prepared. by couplingdiuzotimd amino-urylsulplm mryleinides with unsul phoneted arylmni'nes to the cellulose derive-- tire to he dyed iii-the presence of Water.

55. The process of dyeing cellulose esters und others oomprising applying the dyestuli' prepared by coupling diuzotized m-aniiuw benzene--si zlphonuuilide with w nuphthylamine to ncetyl cellulose in the presence of water.

3. The process of dyeing cellulose esters and ethors, omiiprisiug applying :izo dyesluli's prepared by coupling diuzotized uni)uo-arylsulphouurylemides with unsuiphon ulod urylauxines to the cellulose derivative to he dyed in the presence of Witlfil eonteining sodium carbonate.

l. The process of: dyeing cellulose esters and ethers comprising ap plying the dyestuli. prepared by coupling dinzotized m-aminobenzene-sulphouunilide with e-nephthylamine to aoetyl cellulose in the presence of Water otmteining sodium carbonate.

5. Cellulose esters and others whenever dyed with 21710 dyestuffs prepared by coupling diuzotized unii1io-erylsulphouarylamides Rvith urylamines.

(i. Cellulose esters and others whenevei' dyed with the ezo dyestutt' prepared by coin pling dieuiotized m{unino-heuzene-sulphon unilide with w-uephthylalnine.

In testimony whereof we affix our signetures.

.RUNALD SMITH HORSFALL. LESLIE GORDON LAWRIE JAMES HILL. 

